server/helpers/webfinger.ts

   1 import * as WebFinger from 'webfinger.js'
   2 import { WebFingerData } from '../../shared'
   3 import { ActorModel } from '../models/activitypub/actor'
   4 import { isTestInstance } from './core-utils'
   5 import { isActivityPubUrlValid } from './custom-validators/activitypub/misc'
   6
   7 const webfinger = new WebFinger({
   8   webfist_fallback: false,
   9   tls_only: isTestInstance(),
  10   uri_fallback: false,
  11   request_timeout: 3000
  12 })
  13
  14 async function loadActorUrlOrGetFromWebfinger (name: string, host: string) {
  15   const actor = await ActorModel.loadByNameAndHost(name, host)
  16   if (actor) return actor.url
  17
  18   const webfingerData: WebFingerData = await webfingerLookup(name + '@' + host)
  19   return getLinkOrThrow(webfingerData)
  20 }
  21
  22 // ---------------------------------------------------------------------------
  23
  24 export {
  25   loadActorUrlOrGetFromWebfinger
  26 }
  27
  28 // ---------------------------------------------------------------------------
  29
  30 function getLinkOrThrow (webfingerData: WebFingerData) {
  31   if (Array.isArray(webfingerData.links) === false) throw new Error('WebFinger links is not an array.')
  32
  33   const selfLink = webfingerData.links.find(l => l.rel === 'self')
  34   if (selfLink === undefined || isActivityPubUrlValid(selfLink.href) === false) {
  35     throw new Error('Cannot find self link or href is not a valid URL.')
  36   }
  37
  38   return selfLink.href
  39 }
  40
  41 function webfingerLookup (nameWithHost: string) {
  42   return new Promise<WebFingerData>((res, rej) => {
  43     webfinger.lookup(nameWithHost, (err, p) => {
  44       if (err) return rej(err)
  45
  46       return res(p.object)
  47     })
  48   })
  49 }